US4844287A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leak containment system for underground storage tanks
Assignee: Individual
•
Filing: 1987-11-13
•
Granted: 1989-07-04
•
Expires: 2007-11-13
Abstract
Abstract A double-walled leak containment system for an underground storage tank is provided. The underground storage tank is surrounded, in order, by an inner polymeric containment layer, a liquid transmissive textile, and an outer polymeric containment layer. The outer polymeric containment layer is advantageously formed by spray coating the textile.
Inventors
- 👤 Delmar D. Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:59
CPC Classifications
B; B65; B65D; B65D90/00; B65D90/48; B65D90/50; B65D90/505
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
146 words
A leak containment system of improved tensile, impact and abrasion strength, said system comprising a storage tank surrounded by a liquid transmissive geotextile which is a fabric, further encased by a stretchable, conformable fabric, said stretchable, conformable fabric being coated with, and partially impregnated by in the range of about 40 to 70% of its depth, an elastomer which is a polyurethane useful for preparing a fuel-resistant, hydrolysis-resistant containment layer, said elastomer forming an outer polymeric containment layer, said outer layer partially impregnating said stretchable, conformable fabric to form a composite at the interface of said stretchable, conformable fabric and said outer containment layer; and an inner polymeric containment layer disposed between said liquid transmissive geotextile and said storage tank, said inner polymeric containment layer being in direct contact with said geotextile; wherein an unimpregnated portion of said stretchable, conformable fabric retains its fluid transmissive character.
Claim 2
Dependent Claim
146 words
A leak containment system of improved tensile, impact and abrasion strength, said system comprising a storage tank surrounded by a liquid transmissive geotextile which is a fabric, further encased by a stretchable, conformable fabric, said stretchable, conformable fabric being coated with, and partially impregnated by in the range of about 40 to 70% of its depth, an elastomer which is a polyurethane useful for preparing a fuel-resistant, hydrolysis-resistant containment layer, said elastomer forming an outer polymeric containment layer, said outer layer partially impregnating said stretchable, conformable fabric to form a composite at the interface of said stretchable, conformable fabric and said outer containment layer; and an inner polymeric containment layer disposed between said liquid transmissive geotextile and said storage tank, said inner polymeric containment layer being in direct contact with said geotextile; wherein an unimpregnated portion of said stretchable, conformable fabric retains its fluid transmissive character.
Claim 3
Dependent Claim
19 words
The leak containment system of claim 1, wherein said inner polymeric containment layer is formed from an elastomeric polymer.
Claim 4
Dependent Claim
19 words
The leak containment system of claim 1, wherein said geotextile is provided by a plurality of partially overlapping sheets.
Claim 5
Dependent Claim
15 words
The leak containment system of claim 1, wherein said polyurethane is made from a polyether.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |